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Replacing old broken steam boiler
you may want to change over to forced hot water. Install baseboard radiation or hydro air. Maybe some radiant and an indirect water heater. FHW boilers allow for a lot of flexibility and zoning can increase comfort and reduce operating cost.
Up front cost is an issue a boiler swap could be 4 to 6k a total refit to FHW could be three times that and up. Oil or gas is personal preference pro's & con's on both sides, I am more on the side of gas, feel it is cleaner and easier to work with.
You will get out of your system what you put into it.
Also never use copper above the water line. I have seen two pipe steam converted to FHW. Not usually single pipe. The radiators need to be nippled across the top and changing from 1 to 3 psi steam to 12 to 21psi water may develop some leaks and bring allot of sludge into a new boiler if you do not prep it right.